keysAsStrings.js

// create object with numbers as keys
var object = {
  1: "First Name",
  2: "Middle Name",
  3: "Last Name"
};

console.log(object.1); // Uncaught SyntaxError: Unexpected Number
console.log(object."1"); // Uncaught SyntaxError: Unexpected String
console.log(object[1]); // "First Name"

// Iterating through an object to search for Keys
for (key in object) {
   console.log(key typeof key); //logs 1..3, "string"
   if (key === 1) {
     console.log("This is never logged because key is a string.");
   }
}